Study On Mechanical Structure And Performance Optimization Of Titanium Valve

Kingston valve,as the controlling element of submersible vehicle,has great impact on the safety of submersible vehicle.With the development of deep-sea technology,the diving depth of submersible vehicle increases gradually such that the traditional brass valve cannot meet the need of high-pressure working condition.Therefore,in order to insure the reliability of the Kingston valve working under deep-sea and promote the developing of deep-sea technology,further research on the Kingston valve in new materials,such as titanium alloy,is imperative from the view of theory and practice.In the present paper,the titanium Kingston valve is chosen as the object of study.In the course of the study,the necessity of studying on the mechanics and optimization of titanium Kingston valve is analyzed,and the state of the art of valve and its analysis technology is reviewed.Then the mechanics of the Kingston valve is designed to suit the high-pressure working condition and the practical machining,and the optimization from the aspects of flow channel and antifouling performance is deeply analyzed.This paper mainly focuses on the following aspects:First of all,in allusion toworking condition and the practical machining,the overall scheme of Kingston valve is determined.In particular,a modularization and combination scheme is adopted in the Kingston valve for machining difficulty,a bypass-valvedevicea is introduced for balancing the pressure;and the driving manner of switching between manual and electrical power is used for the speed and realibility of opening and close.Secondly,the key parts of the Kingston valve are determined for example of modular valve body,fore-leading valve and sealing.Then using the software of ANSYS Workbench,the statical analysis and modal analysis are made.The results show that,the strength,rigidity and sealing reliability of the Kingston valve are assured,meanwhile,the absence of resonance under flow force is improved.Then,in allusion to the problem of flow noise,according to the numerically simulating of the internal flow field of valve with different openings,the flow channel is optimized and simulated basing on CFD technology.The simulation results show that,the optimizations of those portions with great flow noise,eg.the antruma portion and tightening portions,are improved excellent property with less flow noise by filling the antruma portion,streamlining and roundingtreatment.Finally,in allusion to the problem of marine organismfouling,according to the analysis of fouling-release mechanism,the optimization of antifouling property of titanium alloy,as well as experiments are made basing on Mcro Arc Oxidation(MAO)and Nanotechnology(NT).The results of experiments show that,the nano additives of Cu2 O in the electrolyte partly enter the MAO coating,in the form of nanoparticles;compared with the control group,the MAO coatings with nanoparticles enables excellent antifouling performance and has positive correlation with the concentration of nano additiveswithin limits.In summary,the present paper has studied and high-pressure,good workbility,low-noise,antifouling titanium Kingston valve basing on simulation and experiments,which provides theoty reference for new material valve.